ZIP code · Frankfort Heights · Illinois · United States

ZIP code 62840 — Frankfort Heights

ZIP code 62840 serves Frankfort Heights, Illinois.

Postal code: 62840
Single source Value from one source, not cross-checked.
City: Frankfort Heights
County: Franklin
State: Illinois
Country: United States
Coordinates: 37.9943, -88.9417 — precision estimated (postal-area centroid)
View on OpenStreetMap
USDA hardiness zone: 7a (0 to 5 °F)
Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
Time zone: America/Chicago (UTC−6 / UTC−5 DST)
Area codes: 779, 815
Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.

Tools: compare 62840 with another ZIP · ZIPs within 25 miles · distance from 62840

Climate — monthly normals

Warmest month Jul (avg high 88°F), coldest Jan (avg low 25°F).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high °F	41	44	55	67	76	85	88	87	81	68	55	44
Avg low °F	25	28	37	46	56	64	68	66	58	47	37	28

NOAA 1991–2020 climate normals from the nearest station: BENTON 2 N (3.0 mi) · NOAA NCEI

About this page

US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.

GeoNames · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page